It is possible to run AutoSplit Professional operations from outside of Adobe Acrobat via a command-line BAT file.
Use this method to automate document processing by starting the processing from
an another application or Windows Task Scheduler. This functionality is available in version 5.6 and up.

You would need to configure the particular AutoSplit operation using a regular method via user interface prior to running
it via a BAT file.

Configure AutoSplit Operation

IMPORTANT: Make sure you are using AutoSplit Pro plug-in.
This functionality is not available in AutoSplit Standard.

Use plug-in's menu(s) to configure a particular AutoSplit operation.
Here is the list of the operations that are supported for the BAT file execution:

Split Document

Auto-Rename PDF Files

Merge Multiple Documents Using Control File

Merge Documents into Single Document

Merge Documents from Multiple Folders

Merge Documents with Similar Filenames

Save the Processing Settings

Each of the above mentioned operations provides a way to save processing parameters as a settings file.
For example, for "Split Document" use "Save Profile" button to save settings as *.apr file.
All other operations have a set of "Save Settings" and "Load Settings" buttons for saving settings into a file.

Here is a list of settings file extensions for each operation:

Split Document: *.apr

Auto-Rename PDF Files: *.docren

Merge Multiple Documents Using Control File: *.mergefile

Merge Documents into Single Document: *.ams

Merge Documents from Multiple Folders: *.mfmf

Merge Documents with Similar Filenames: *.mfmf

Create a BAT File

Use any plain text editor (such as Notepad) to create a blank text file.
Add the following lines to the file.
Make sure to replace paths and filenames with the actual filenames you are using.

The example below shows how to start Acrobat DC and split Test.pdf PDF file
using the document splitting settings from SplitProfile.apr file.

The environment variable AUTOSPLIT_INPUT_FILE is used to specify a full file path to the PDF file
that needs to be used for the job while AUTOSPLIT_CONFIG_FILE specifies a full file path
to the settings file.

The environment variable AUTOSPLIT_MODE is used to specify a processing operation.
Here is the list of the supported values:

Split - Split Document

RenameFile - Auto-Rename PDF Files

MergeControlFile - Merge Multiple Documents Using Control File

Merge - Merge Documents into Single Document

MergeFolders - Merge Documents from Multiple Folders

MergeSimilar - Merge Documents with Similar Filenames

Passing a Filename to a BAT File

You can pass a file path to the BAT file to make it run on a specific input file.
Make a small modification to the BAT file to allow using parameters.
When you call a batch file, you can enter data after the command that the batch file refers to as %1, %2, etc.
For example, the following command assigns the first parameter passed to the
BAT file to AUTOSPLIT_INPUT_FILE variable.

Use AUTOSPLIT_LOG_FILE variable to specify a log file location.
If a log file does not exist, it will be automatically created.
If a log file already exists, then new records will be appended to the file.
Log files can be used for troubleshooting and record keeping.

SET AUTOSPLIT_LOG_FILE=C:\Data\AutoSplitLog.txt

Processing a Whole Folder

Only two commands (Split and RenameFile) take input file as a parameter.
Alternatively, it is possible to specify a folder instead of an individual PDF file.
All PDF files from the folder will be processed one by one.
Use AUTOSPLIT_INPUT_FOLDER variable to specify a full path to the processing folder.

Note that all "merge" operations do not use AUTOSPLIT_INPUT_FILE variable,
because the input files for the merge are specified
as part of the settings. There are typically more than one input file involved.
You can use the example below for all 3 merge operations.